sqrt_x.py 源码
# 求x的平方根
class Solution:
def mySqrt(self, x: int) -> int:
lo, hi = 1, x
while lo <= hi:
mid = (lo + hi) / 2
if mid * mid < x:
lo = mid + 1
elif mid * mid > x:
hi = mid - 1
else:
return mid
return hi